Obama Encourages Next Generation To Carry On King's Vision

Freedom bells rang out in Washington and across the country on Wednesday, as Americans marked the 50th anniversary of Martin Luther King's "I Have a Dream" speech. President Obama, who's often noted his own debt to the civil rights leader, praised the tens of thousands of Americans who marched with Dr. King in 1963. He also challenged a new generation to continue to press for racial and economic justice.